JP2003336487A - Lock mechanism for extrusion type cutter - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a lock mechanism for an extrusion type cutter locking the cutter at an arbitrary extrusion position. <P>SOLUTION: This lock mechanism 4 for the extrusion type cutter locks the cutter 3 extrudably provided on a cutter spoke 2 or a cutter face plate of a shield machine 1. This lock mechanism is provided with a support member 15 provided rearward in the extrusion direction of the cutter 3 and supporting the cutter 3 from the back, and a wedge member 14 slidably provided along the support member 15 and inserting into a space between the cutter 3 and the support member 15. <P>COPYRIGHT: (C)2004,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a lock mechanism for fixing a cutter pushed toward the natural ground.

[0002]

2. Description of the Related Art A cutter bit of a shield machine excavates as it excavates. Therefore, as shown in FIG.
There is one in which a cutter 36 is provided at the tip of the hydraulic jack 30 so that when the cutter bit 5 is worn, the hydraulic jack 30 is extended and pushed out toward the natural ground side.

Further, if the cutter 36 is simply pushed out by hydraulic pressure, the hydraulic hose 37 and the like may be expanded due to excessive hydraulic pressure, and the cutter 36 may be pushed back.
At 0, a lock mechanism 31 for locking the cutter 36 once pushed out so as not to move backward is provided.

The lock mechanism 31 is designed to insert and lock a lock pin 35 projecting from the cylinder portion 34 side into a locking recess 33 formed at the rear end of the piston rod 32.

[0005]

By the way, the hardness of the ground varies depending on the location, and a very hard bedrock may be dug. Even if the cutter 36 is pushed out in such a bedrock, it may not be pushed out completely.

In such a case, the cutter 36 is used for the time being.
I want to push out and lock as much as I can push out, but I want to dig,
If the locking recess 33 does not reach the position of the lock pin 35, the lock pin 35 cannot be inserted into the locking recess 33, and the cutter 36 cannot be locked.

Therefore, an object of the present invention is to solve the above-mentioned problems and to provide a locking mechanism for an extrusion type cutter capable of locking the cutter at an arbitrary extrusion position.

[0008]

In order to achieve the above object, the present invention provides an extruding cutter locking mechanism for locking a cutter that can be extruded on a cutas pork or a cutter face plate of a shield machine. A supporting member provided at the rear of the cutter in the pushing direction to support the cutter from the rear, and a wedge member slidably provided along the supporting member to be inserted between the cutter and the supporting member. Be prepared.

The wedge member may be formed so that the tangent of the taper angle sandwiched between the surface contacting the supporting member side and the surface contacting the cutter side is smaller than the friction coefficient of each surface.

A plurality of the wedge members may be arranged side by side in the same direction and connected, and may be formed so as to be inserted between the support member and the plurality of cutters at once.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT A preferred embodiment of the present invention will be described in detail with reference to the accompanying drawings.

As shown in FIG. 4, a plurality of cutters 3 are provided on the cutas pork 2 of the shield machine 1 so as to be extrudable and arranged in a line, and a lock for locking each cutter 3 is provided. A mechanism 4 is provided.

As shown in FIGS. 1 and 2, the cutter 3 is
It is composed of a plurality of cutter bits 5, a pedestal block 6 that holds these cutter bits 5, and an extrusion hydraulic jack 7 that pushes the pedestal block 6 in a retractable manner.

The pedestal block 6 is formed on the front side in the direction of excavation, and has a bit holding portion 9 protruding from the front surface portion 8 of the cutass pork 2, and a slide formed on the rear side of the bit holding portion 9 so as to extend in a substantially cylindrical shape. And a base 10.

The slide base 10 is supported by a slide guide 11 provided integrally with the Kattus pork 2 so as to be slidable in the cutting face direction. Slide guide 11
Is formed in a cylindrical shape that surrounds the outer periphery of the slide base 10 in a watertight manner, and is provided on a partition plate 12 that partitions the inside of the Katta spoke 2 into front and rear. The outer circumference of the slide guide 11 is in close contact with the partition plate 12 over the entire circumference, and the internal space of the Kattus pork 2 is divided into two parts in a watertight manner with the partition plate 12 as a boundary.

The slide base portion 10 also has a pair of leg portions 13 formed by splitting the rear end side into two forks. Legs 13
Is to be seated on a wedge member 14 which will be described later, and its rear end is appropriately inclined so that the cutter bit 5 faces the cutting face when seated on the wedge member 14.

The hydraulic jack 7 for extrusion is composed of a slide base 1.
0 is accommodated inside, and one end is rotatably connected to the pedestal block 6, and the other end is rotatably connected to the back surface portion 15 of the Kattus pork 2. And
The push-out hydraulic jack 7 is adapted to push the cutter 3 toward the face of the face by stretching.

As shown in FIG. 1, FIG. 2 and FIG. 3, the lock mechanism 4 is provided at the rear of the cutter 3 in the pushing direction, and the lock mechanism 4 is provided.
A rear surface portion 15 as a support member for supporting the rear side of the blade, a wedge member 14 slidably provided along the rear surface portion 15 and inserted between the cutter 3 and the rear surface portion 15, and the wedge member 14 and the rear surface portion. And a locking hydraulic jack 16 provided between the wedge member 14 and the wedge member 14 for slidingly moving the wedge member 14 along the back surface portion 15.

The back surface portion 15 of the Kattus pork 2 is formed substantially parallel to the front surface portion 8 and is formed so as not to be deformed even if a force is applied from the natural ground.

The wedge member 14 is formed in a wedge shape which forms a taper angle θ between a bottom surface 17 contacting the back surface portion 15 side and a taper surface 18 contacting the cutter 3 side, and the leg portions 13 of the cutter 3 are respectively formed. It is adapted to be supported by a pair of wedge members 14.

The taper angle θ of the wedge member 14 is determined so that when the load from the ground is transmitted to the wedge member 14, the wedge member 14 does not slide on the back surface portion 15 due to frictional force.

Specifically, as shown in FIG. 6, the load from the ground is F, the vertical component of the load F with respect to the tapered surface 18 is F _y, and the parallel component of the load F with respect to the tapered surface 18 is shown. If F _x , the parallel component force F _x and the vertical component force F _y can be expressed as in Formulas 1 and 2. However, the taper angle of the wedge member 14 is θ.

[0023]

[Formula 1] F _x = F · sin θ

[0024]

F _y = F · cos θ The frictional force M is generated by the vertical component force F _y, so that the friction coefficient of the tapered surface 18 can be expressed by Equation 3.

[0025]

Meanwhile Equation 3] M = F _y · μ, in order to wedge member 14 does not slip in the tapered surface 18,
It suffices that the frictional force M is larger than the parallel component force F _x as shown in the equation 4.

[0026]

## EQU00004 ## _F.sub.x <M conditional expression Expression 4 becomes Expression 5 from Expression 1, Expression 2 and Expression 3, and when Expression 5 is rearranged, it becomes Expression 6.

[0027]

[Equation 5] F · sin θ <F · cos θ · μ

[0028]

Tan θ <μ That is, the taper angle θ is determined so that tan θ (the tangent of the taper angle θ) is smaller than the friction coefficient μ. However, if the taper angle θ is too small, the wedge member 14 becomes unnecessarily large and cannot be accommodated in the cutas pork 2, so it is preferable to determine the taper angle θ so that tan θ becomes equal to the friction coefficient μ.

The wedge member 14 has a taper angle of 9 ° to 1
It is set to about 0 °.

A plurality of wedge members 14 are arranged side by side in the same direction and are connected to each other, so that the wedge members 14 can be collectively inserted between the back surface portion 15 and the plurality of cutters 3. There is.

More specifically, the wedge members 14 are connected at intervals in the sliding direction at the same pitch as the intervals between the cutters 3, and the wedge connecting body 19 sandwiches the pushing hydraulic jack 7 between the wedge members 14.
The columns are slidably moved in parallel and symmetrically. The wedge connecting body 19 is slidably moved to lock the cutters 3 at the same pushing position.

The hydraulic jack 16 for locking is the wedge connecting body 1.
It is prepared for each 9 and one end is connected to the vicinity of the center of the wedge connecting body 19 and the other end is the back surface portion 1 of the cutas pork 2.
It is connected to 5. And the hydraulic jack 1 for locking
6 is extended so that the wedge connecting body 19 is pushed in with the tip end thereof in the sliding direction.

Further, as shown in FIG. 4, the cutass pork 2 is formed so as to be divided into an inner peripheral portion 20 and an outer peripheral portion 21, and by dividing it, a child shield is formed on the inner peripheral side. ing.

In the inner peripheral portion 20 and the outer peripheral portion 21 of the cutas pork 2, the cutters 3 are locked by different wedge connecting bodies 19, respectively.

As shown in FIG. 5, the pushing hydraulic jacks 7 arranged on the outer peripheral portion 21 or the inner peripheral portion 20 of the cutas pork 2 are the same hydraulic pipes 22, 23, 24 on the extension side and the contraction side, respectively. , 25, the hydraulic pressure is applied, and it is always expanded and contracted at the same time until the expansion and contraction can be stopped by being blocked by the bedrock.

Similarly, the locking hydraulic jacks 16 arranged on the outer peripheral portion 21 or the inner peripheral portion 20 of the Cattus pork 2 are also hydraulically connected to the same pipes 26, 27, 28 and 29 on the extension side and the contraction side, respectively. Is supposed to be taken.

Next, the operation will be described.

When the cutter 3 is pushed out toward the face, hydraulic pressure is supplied to the extension side of the pushing hydraulic jack 7. The pushing hydraulic jacks 7 are respectively extended, and the cutter 3 is
While being guided by the slide guide 11, it is pushed backward by the pushing hydraulic jack 7 and pushed out toward the face. As a result, the legs 13 of the cutter 3 correspond to the corresponding wedge members 1.
It is separated from 4.

Then, while continuing to supply the hydraulic pressure, the hydraulic pressure is supplied to the extension side of the locking hydraulic jack 16. The wedge connecting body 19 is slid outwardly in the radial direction of the cutas pork 2 along the back surface portion 15 and fits between the leg portion 13 and the back surface portion 15 of the cutter 3.

At this time, when there is a cutter 3 which cannot be completely pushed out, the wedge member 14 is fitted only between the cutter 3 which cannot be pushed out most and the back surface portion 15,
The wedge coupling body 19 can stop the sliding movement. Then, when the hydraulic pressure supplied to the lock hydraulic jack 16 exceeds a predetermined pressure, the hydraulic pressure supply is stopped, and the hydraulic pressure supply to the pushing hydraulic jack 7 is stopped.

The cutters 3 floating from the wedge members 14 are pushed back by the forces received from the natural ground, and are seated on the corresponding wedge members 14 and stop. This allows
The respective cutters 3 can be aligned and locked at the push-out position of the cutter 3 that could not be pushed out most, and the digging can be performed again.

At this time, a force F is applied to the wedge member 14 in the direction of pressing the wedge member 14 against the back surface portion 15, but the frictional force M of the tapered surface 18 becomes larger than the parallel component force F _{x of the} force F. Since the taper angle θ is determined as described above, the wedge member 14 is not moved by the force F, and the pushing position of the cutter 3 can be stably locked.

Further, if the force F acting on the wedge member 14 is large, the frictional force M also becomes large accordingly, and since the wedge member 14 has a structure that does not require large strength, the force acting like the pin lock system. Pin according to F (lock mechanism)
It does not need to change the design strength of and can be used for general purposes.

Since the cutter 3 has a uniform extrusion rate, it is possible to excavate the ground evenly and to stably excavate without breaking the face.

When the cutter 3 cannot be completely pushed out in this way, the cutter 3 is pushed out to the face of the face by the same procedure after excavating and changing the position. The cutter 3 can be pushed out again because the ground is newly changed. Then, the wedge coupling body 19 is slid and moved in the same procedure to lock the cutter 3.

When the cutter bit 5 is replaced, or when it is no longer necessary to excavate the ground using the cutter bit 5, the locking hydraulic jack 16 is completely retracted and the cutter 3 is moved to the tip side of each wedge member 14. Lock with. The cutter 3 can be locked at the normal position before being pushed out, and when the cutter bit 5 is worn or when it is necessary to excavate the ground with the cutter bit 5, it can be pushed out again toward the face.

As described above, in the push-out cutter locking mechanism 4 for locking the cutter 3 that can be pushed out onto the cutas pork 2 of the shield machine 1, the cutter 3 provided behind the cutter 3 in the pushing direction is used. Since the rear portion 15 (supporting member) for supporting from the rear and the wedge member 14 slidably provided along the rear portion 15 and inserted between the cutter 3 and the rear portion 15 are provided, the cutter is configured. If 3 cannot be extruded completely, it can be locked in any extrusion position that could have been extruded. The cutter 3 can be locked by the same lock mechanism 4 regardless of the magnitude of the load acting on the cutter 3.

Since the wedge member 14 is formed so that the tangent of the taper angle θ is smaller than the friction coefficient of either the tapered surface 18 or the bottom surface 17, the wedge member 14 is moved along the rear surface portion 15 by the force received from the natural ground side. The cutter 3 can be locked stably without sliding.

Since a plurality of wedge members 14 are arranged side by side in the same direction and are connected so as to be collectively inserted between the back surface portion 15 and the plurality of cutters 3, the respective cutters 3 are always aligned at a constant extrusion position. The face can be stabilized.

Further, especially when a high-strength wall (not shown) is buried along the excavation path, the cutter 3 can be flatly applied to the flat wall surface, and the high-strength wall can be stably excavated without cutting. Can be pulled out.

Although the locking hydraulic jack 16 is provided between the wedge member 14 and the back surface portion 15, it is not limited to this. It suffices that the wedge member 14 be slidably moved along the back surface portion 15, and specifically, it may be provided between the wedge member 14 and another portion of the cutas pork 2 or a cutter face plate (not shown).

Although the cutter 3 is provided in the cutas pork 2, it may be provided at another position such as the cutter face plate.

The hydraulic jack 7 for extrusion includes the slide base 1.
Although it is assumed that it is housed inside 0, it may be divided.

The cutter 3 may be a copy cutter (not shown).

Although the cutter 3 and the wedge member 14 are pushed out by the hydraulic jacks 7 and 16, respectively, the present invention is not limited to this. It may be pushed out by another driving device such as an electric jack (not shown) or a hydraulic motor (not shown).

Although the cutters 3 are arranged in a line, they may be arranged freely. In this case, it is advisable to change the shape of the wedge connecting body 19 according to the arrangement of the cutter 3.

[0057]

In summary, the present invention has the following excellent effects. (1) The cutter can be locked at any extrusion position. (2) A plurality of cutters can be locked at the same extrusion position. (3) It can be used regardless of the magnitude of the force received from the natural ground.

[Brief description of drawings]

FIG. 1 is a side view of a lock mechanism for an extrusion type cutter according to a preferred embodiment of the present invention.

FIG. 2 is a sectional view taken along the line II-II of FIG.

3 is a sectional view taken along the line III-III of FIG.

FIG. 4 is an enlarged view of a main part of the shield machine.

FIG. 5 is a hydraulic piping system diagram of hydraulic piping connected to a hydraulic jack.

FIG. 6 is an explanatory diagram illustrating balance of forces acting on the wedge member.

FIG. 7 is a side sectional view of a conventional push-out cutter locking mechanism.

[Explanation of symbols]

1 shield machine 2 cutter spokes 3 cutters 4 Lock mechanism (Lock mechanism for extrusion type cutter) 14 Wedge member 15 Back part (support member) 17 Bottom (Surface) 18 Tapered surface (surface) θ taper angle

   ─────────────────────────────────────────────────── ─── Continued front page    (72) Inventor Katsuya Hasegawa             1-25-1 Nishi-Shinjuku, Shinjuku-ku, Tokyo Taisei             Construction Co., Ltd. (72) Inventor Shigeo Fujii             11-11 Kitahamacho, Chita City, Aichi Prefecture Ishikawajima Harima             Heavy industry Aichi factory (72) Inventor Takeshi Yasui             11-11 Kitahamacho, Chita City, Aichi Prefecture Ishikawajima Harima             Heavy industry Aichi factory (72) Inventor Kazuyuki Tobita             11-11 Kitahamacho, Chita City, Aichi Prefecture Ishikawajima Harima             Heavy industry Aichi factory F-term (reference) 2D054 BA07 BB05 BB06

Claims (3)

[Claims] 1. A lock mechanism for an extruding cutter for locking a cutter that can be extruded on a cutout pork or a cutter face plate of a shield machine, and supports the cutter from the rear in the extruding direction of the cutter. And a wedge member that is slidable along the support member and that is inserted between the cutter and the support member, the locking mechanism for the extrusion type cutter. 2. The wedge member is formed so that a tangent of a taper angle sandwiched between a surface contacting the supporting member side and a surface contacting the cutter side is smaller than a friction coefficient of each surface. The lock mechanism for an extrusion cutter according to 1. 3. The lock for an extrusion type cutter according to claim 2, wherein a plurality of the wedge members are arranged in the same direction and connected to each other, and the wedge members are collectively inserted between the support member and the plurality of the cutters. mechanism.